North American deermouse records in Michigan lean heavily toward the western Upper Peninsula. Gogebic County alone holds 2,109 of the 2,429 records, and Ottawa National Forest, which covers much of that corner of the state, accounts for 1,949, with Isle Royale National Park adding 24. Few North American mammals range as widely as this one, and Michigan’s record reflects that: it turns up from mainland boreal forest to isolated Isle Royale in the middle of Lake Superior.
The record spikes hard in summer, climbing from 172 in June to 874 in August before dropping back by October, a swing that tracks trapping-survey timing and peak summer activity far more than a real late-summer population boom. NatureServe ranks the species S4, Apparently Secure, statewide.
Full species profile
